Sierra 18-5777 Switch Box Sierra Switch Box Meets or exceeds the original equipment quality Sierra part number: 18-5777 Interchangeable with the following: CDI 114-7452K1, Mallory 9-25102, Mercury 339-7452A19, 339-7452A15, 339-7452A7, 339-7452A9 Fit specific, check part numbers to ensure proper fit